Improvement in apparatus for recovering waste alkalies



J. W; DIXON.

APPARATUS FOR RECOVERING WASTEALK'ALIES.

No.187, 751. Patented. Feb. 27, 1877.

UNITED STATES PATENT ()rrron.

JOHN W. DIXON, OFQPHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN APPARATUS FOR. R EC OVERING WASTE ALKALIES.

Specification forming part of Letters Patent No. 187,751, dated February 27, 1877; application filed September 7, 1876.

To all whom 'it may concern:

Be it known that 1, JOHN W. DIXON, of

the city of Philadelphia, State oi Pennsylva- Ina, have invented a new and useful Improvement in Apparatus for Saving Soda-Ash used in reducing vegetable liber to paper pulp; and I do hereby declare the following to be av full, clear, and exact description of the same,

reference being had to the annexed drawings,

making part hereof.

the combination of a heat-passage, a coil of pipe placed in said passage, a pump upon saidcoil, an evaporating-pan, under or in contact with the shell of which the'heat-passage passes, and an incinerating hearth and furnace, both opening into said passage.

To enable others skilled in the art to make and use my invention, I'will describe its construction and operation.

In the drawings, A is the evaporator; B, a pipe, attached to the bottom of it, upon which is located pump 0. B is a coil of pipe situated in the fire-passage K-that is, in the passage through which the fire or heat passes to the chimney; B, a pipe leading from the coil B over the top of' evaporator A to the spray-head I, which passes through the top of the oven, and points toward the incinerating-hearth D. This spray I is here shown as consisting of a number of small tubes from pipe B. E is that part of the apparatus containing the furnace; G, the chimney.

fire from the furnace located at E passes through the space above the hearth.

The liquor having been placed in evaporator A, the tire is started, and pump 0 also. the liquor flowing down pipe B is driven forward by pump 0 through coil B and pipe B" (cock H being closed, and cock El open) to the spray-head 1, from which it is thrown in several sprays onto the incinerating-hearth, and in its sprayed condition between the spray-head and the hearth it is compelled to pass through the intense heat of the direct flame. from furnace E, which evaporates it very rapidly. There are thus three agents at workin evaporating, though the heat is from one fire-to wit, the evaporator A, and the fire-space through which the spray from sprayhead I has to pass to reach the incineratinghearth D. This operation is continued until a sufficient charge is placed upon the incinerating-hearth. In that case cock H is closed, and H is opened,.thus directing the liquor from coil B back into the evaporator A as fast as it is received. The branch H throws the liquor with. all the force from the pump 0, causing the surface of the liquor in. evaporator A to be much disturbed, and thus assisting in theevaporation. A spray-head may be placed upon the delivering-nozzle of the branch pipe containing cock H, so as to spray the hot liquor, thus allowing the hot liquor to expel its contained steam. This will assist evaporation. If it is ever found that the liquor in evaporator A is too thick for spraying, or to pass through the pipes to the spray-head, it may be raked directly or allowed to run from a hole in the side of evaporator A down through the oven-top through a tube or trough upon hearth D. The sprayhead I may be employed in various forms. A rose-head might be used, ora long tube with openings at intervals of its length. This last-named form would possess the added advantage of being placed right in the oven above the hearth, and so would become itself highly heated, and would heat the liquor conspray it. A long tube might be placed inside and along the length of the oven, having openings at intervals of its length to throw diverging series of spray or diverging sheets of liquor. v

Instead of coil B, which is an elongated coiled chamber, a series of cham hers or an ordinary box-chamber alone might be used, as very little pressure is to be withstood by it. After the partially-evaporated liquor reaches hearth D, all foreign matter is finally burned out of it by the fire from furnace E.

It will be seen from the drawings that the heat-passage K leads directly from the furnace E to the stack G, and passes over the incinerating-hearth D, under the evaporatingpan A, and that the coil B is situated in its course. When acharge is ignited upon hearth D, its heat unites with the furnace heat to heat evaporating-pan A and coil B.

I have described one style of apparatus in my Letters Patent numbered 179,536, dated July 4, 1876.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of a furnace, E, heatpassage K, evaporating-pan A, over the passage K, coil of pipe B placed in said passage, and having upon it a pump, 0, to circulate theliquor fromthe evaporating-pan A through the coil and back to the said pan A, whereby one furnace is used to heat the evaporatingpan and the coil containing the liquor in circulation, substantially as described.

'2. The combination of .a furnace, E, incinerating-hearth D in the heat-passage K, evaporating-pan A over the passage K, coil of pipe B placed in said passage, and having upon it a pump, 0, to circulate the liquor through the coil, from and to the evaporatingpan A, whereby the united heat from the furnace E and the hearth D, through passage K, heats both the evaporating-pan A and the coil B containing the liquor in circulation, substantially as described.

,JOHN W. DIXON.

Witnesses: W. W. DOUGHERTY, GEORGE E. BUoKLEY. 

